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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f05065a80c8f1212f751c546807a28b3d951fa51905ef3867f011111adb3d78' 
  AND token = 'ddmnEzsSUSCk547q6wNH00mUKhpEq+LJvWIk/nDxPAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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