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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5d5aaa981b4f0ef9ee4c6b5cbd53ba8aa375b56d2e69b251c84a748d31b8a5' 
  AND token = 'a+ORLnn2qYl6N9Dd+XS0b4laV8FuveY58rZvO4roK1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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