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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80481d3ce7c7858a57cf2033d1ef4ffff41adaa7dba19693dc29ca2b0262e3f0' 
  AND token = 'wBLVpbCu6wytrBNAoa5DwfK7M6MMuOE66PcvD1X4OUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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