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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f67696f4ae6f7a53ceee5f18cf1ee17252951b812c635b02e1f3f0d2c151c2' 
  AND token = 'I1JDXt7GO2Kd39RXDiio/R/ynlDqrcNhCuUGaiX8tpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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