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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2a2d0e592f8da0a88bef41237bc2717f253118d3cf270376aea8aa162a14d2' 
  AND token = 'nOexljAqDLZu9shbF01KWsKlVGEqaU4fWjFyDeen8tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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