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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765f871c3fbbb5b9e6b9f505a392d3bee11ced97ac26aabd2dbd04f70beba685' 
  AND token = 'LiiR8NeZ25FYdidHD5Z51d2i8qcr56DmE1YfMrwI8qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}