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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd190d8dc82ee37639a4374dfd7231b72e73dc32fb783991004af3670b146d8' 
  AND token = 'zvf7yci13SR4qF1xliJxKyjoefDVtRwXEIyXU3LX+NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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