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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c4e4b796e3e5fba172b873bbc6867d6fccdf7b20b3458e8141ffc995a759df' 
  AND token = 'iYyiYBvv7M43b6P1BNCIbOV3Ox3EFMeyBiHTpZbCYqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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