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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0b874858eb8de51e44741b93d2ca043ef71e54cdf28d476fa8c9b49c2d9a08' 
  AND token = '44lAhJIb7GO80/EqHYcdhJ0a75YppRgCcNtl+w1+jy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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