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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7804d86aa32e949acdda82d01a6eade4bd0ce67075e29fe2f7fa0e9337403d' 
  AND token = 'RZriBj1ONs6YSRapyOw1QwJcy5+AIz4e+6iKy/xB7QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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