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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3862613edf5e764eac4686238809b2109cd373dd5a186f7551090b1a77dd36a' 
  AND token = 'ql4Ti1/Yrpz5M1j1qDd806DCPviflODhgx4iuEPGF3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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