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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec6d916fe524d3488684f0f5ecb21093d51aa5389e63874c33602dc7e1218ae' 
  AND token = 'ng/hwe7hh4jm3cXF0ryppcP4T1ZqgAWdXAfmCk7SrPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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