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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949b3eb4905c242c146c6c5c837d94b41544dfda387e928b5c8501f02d345a58' 
  AND token = 'Z3a19vRjDEmUuhvT5po04vcFPqf/6oE4jwFoijO1AI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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