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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaa37499c45fec2f533c9c03e3c1060536ac9d189721baf29cac4bd235d9dc7' 
  AND token = 'dgWlzVMdCtN0gymTcwOo5quvGx+PhgCuznkKBnN5zr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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