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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b552ccdad6bc9ced9689a0d4b827264c84dbbc604472bf3ee3f7957e6260d8c3' 
  AND token = 'faC70oxbMFrfXibXhFlUrvV40OKzT9Qu7gRE/n43jQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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