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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16958c4e956556defa7bf252e627d8647dc067f2eb1795d1e7f59174e6a33b3' 
  AND token = 'U8oYs1YksZaFe8aro4gKviD1aVn60zI6CnQnb1LQc/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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