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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cd933198e8d69eeb64f30609d6947a6a3a4c09a8d8537a38bee41893a44484' 
  AND token = 'PE+2Xif1BfsYrTbMtIk7NjFlG+DkLxO4yxnkpa2Cf6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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