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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29150055e99f7cb1f65655f7836c81912e1db4c94778811837e4ff19c40887a6' 
  AND token = '9uzlmiMzLlqkJ0OkLAU2ad5ytnPWt5TiidKbf+iu9cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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