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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51de788eaea16c8adda6849d8af86a0c63136fa14bffc520e549ce75b3121365' 
  AND token = '71Y0lGdRLMf3FTB93dem2mU816YI143TkMCI1heGPQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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