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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70c7f463a79a646c53b25ce1d6a1a8f479ed33327290d6bb1e1cd4f1f5c9a79' 
  AND token = 'SFmRYkRNbrmGCRkZtj6UKC4G1sUXNJldgtnk91v+SI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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