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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ff2025d7f1251509172239397c62539603919567f7ec5b0f342b6c35253902' 
  AND token = '9X4s2Jn66HkPXj6ASNPfUFq/CAVrIvcLbSmiIjQWxJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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