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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d335ba4e7f0d1fc7a40ee894af6d01e22c18fe9b5c527ea711c4d80269be0a' 
  AND token = 'vWW6/tH54w3GneSZy6QZJBaPO/bUi2uRa6LHNg99FNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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