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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cddcec036eb7605504d990f9dfec1cc5c031f39e39341f2fa8902c043b0ff69' 
  AND token = '+7l+q8HoDQrmD+JVwQHn/cM/LcSOl68CCgNBB9vmrVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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