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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290b3e608b778f64b676a28d789e4083ad1089f3091618635334ce402aec17fb' 
  AND token = 'w8NMkN9dCZGG1oN0Ca95iZyXMqn+wT0pm+qvK2nvokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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