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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7eb69558540df803474a38fd5440960243b311a970a4721a4093b9e25216cc8' 
  AND token = 'ippLz1gLWcfKw5Nzlmfa+yuqJ0Lq0iKvPZanco+6+8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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