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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176026c1c02d1d2c6493842147de6eafe2198c8ecd835a83c63086f00cc01303' 
  AND token = 'HEFLP7armgCRanUrVR4zbLDtVxoMcFA2b+Smj5Xn7Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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