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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea0de6ca9c42008458c24543321f88e91c121489d9a089fff5651c1b6c9e470' 
  AND token = 'cgtTTsp7sq9NtGW0xLB1Rhm8x7/BvH75v7i2vdKvJY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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