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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f294790031ceb2bc8627dcb9ac10a0157a7b4cac1ebf2fd6515378be806770' 
  AND token = 'muhR2RG0dt/dnBzRtAa4u/HUcBJNoz9Xin4L/hMjbxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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