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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552e1f5f3048b291702c4ad6c1acdec5515fdd2d752634015f18ff7f09692762' 
  AND token = '3rhRPFPq3jCVYMLhAS5ZFQC9xFqQTY9mEZxINiqhVuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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