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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c045de08b973135e4a113db632e8f4c88c567d0b56d46c5439e804a8f54316' 
  AND token = 'gpzI5AKDGcPYK23CRr9spg3fWYJWYdkb/o+Z06ajksU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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