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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc36cd23ef9e9820c8d042103435a768d4e562aca34be023757780f4c940090' 
  AND token = 'K+4R/77FIKGqNGHQweWQ5svX1+FLMIxsBW+x0Ieiiy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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