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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11fc63fc89932a3407c42a01e11ffb59d18f4215d6804ca9526b065e1de673f' 
  AND token = 'r4zsskEtV6xXEWU62t3wafRCVvtscF/IU70k/fLmmtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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