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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7c7a9bef34eaa706aae42820fa08e4a026a65cd2def6742ab1bc68b2b59744' 
  AND token = 'uzci2SFtBYRYlgH5O12s/e+FiRz4C0Gsbd7symaCs5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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