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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4c71156928da924f55ed893dfbb39e0b43f0891fff8ff8a0933e408225ce1c' 
  AND token = '5EoSlLOgPbVI3c1mz2twqvVau39Uc2WSibYMlkrpo8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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