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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e6480d019a23efa5b8ff6a5db62bdac9bd5d976d284fc958ac6a4c7fc96586' 
  AND token = 'OYm7e0OEq2a4CKYSd9NIL9UReTjq/nYwVjtmVsxaVWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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