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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700de9d0c8dffa058e72757053280582b2fd57dbfe5652251cb9f07cb2db43ac' 
  AND token = 'iYYUWQ0HGIocBuO/Wx4eM465Dr70MTkvKBjs0XxLqaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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