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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcac016f59dc35b942f34361e0326f96b4f2c5a21fa73ab1a4255cb0dfaff818' 
  AND token = '9f5HAV/2nT61D+/oXMXX1K1ow4ECgiMvHDuBH9mXAnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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