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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce14c35e1941a0916339b09eb020a9d2330af7ba9ed007c9ef3db895cdd5130' 
  AND token = 'EGcOtJh9ulXutiMcvI45hqhYtPnFmJJnbLlOXm2zAQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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