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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b8e881c893fc543c69cf9ee1d5cdb1152f56386e06886f2029ee97fe47f02c' 
  AND token = 'otCbVwbLTiaEQcq8aEjVnh7h5emh1uY56/ZxeEfwRak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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