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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58dd29086351ef9c10bf58a7b65cb5664c1ecd2c399a75e9c4c4509d93aed36' 
  AND token = 'hZn9JcrfRjc0NuGIiweYDNJzmnVF+FG8/j8iU48fkMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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