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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caadb4fa4133152bd1f41df1203911752c4240a0ab49c39f452a8cdf44b0cecb' 
  AND token = '4qBf9a8KDczwMVWc4B+DwVU8Gyp4gofy0w8LNKNN0G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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