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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac5f851c992183267d8e5b039ffd567fa4cbb78718e3e45e0bed9669278a14b' 
  AND token = 'U5caYv+mCO1l7aCtCsoEoHmVle3lcfBATY50CAWaPFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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