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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805b61a83e6fd83539d751fa11092b7ec04f5185c2221e57ea5a9cac13bfec10' 
  AND token = 'r0w3wiZ9G1SKO2Pq9211+ETwYfM/85psNetXa9NgJlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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