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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eca77c81b4b89e9f7a31460a39ffd632ae2e17076fe8c0f6dd69a210b9a737' 
  AND token = '1IMOnL+tSQKQJz3eMHnS/RkhzomiJyxb5SylNp/JLvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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