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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cea1748c2195562c96b14607dda3f6f99dffda750d0f6a0819bc2061a6d23d' 
  AND token = 'V7ifbMazd217dFtKHnJ6oytchr+HBswfg3XL+t2fiTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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