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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb93663e1a82a81dd37175bd9bd2a5680a789269d1d7d7ef08d73dcb62651a98' 
  AND token = 'AEuWGvDz6ggk4UUhXXh9fsqdLte+8/nOatB7sAWAeX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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