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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c714c3eeb99b35aace8f803f7d272020b7e17cbc2771848e034c6bf5cacc4a14' 
  AND token = 'neAWGc5enop5tSnbZWpGRA6MOF0w0LKHZPS3ddJaF+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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