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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d10937019b397ad91fe131a3e2732c131e44d062d34886b1e752376b3ac35c2' 
  AND token = 't7qkEzWVVv3blvqXoa8fCP6zbZ/btuFNnVDseSi9aTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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