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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937800c9838c538656ac931c200c8b1a8e07398f8f20022c5a007e1551a46239' 
  AND token = 'jBnOmNQ/rNq0+1pGgbYf1ZBrHej+iN+ES7NgEf54ZzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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