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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e139916fc4fb6d6fdfaa2db6b1bf4c82c2fa471eac15e0cf579aa37865184d7' 
  AND token = 'Uc5f6ynLgye6F1NkHeGcgpG7DZuOfK4TLyg46QUct2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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